-ing modifiers (participle phrase) with and without a comma
This page is really short but important.
To hit the perfect score in the SAT and the ACT, understand how these two sentences are different.
I saw Jane, walking down the street.
vs.
I saw Jane walking down the street.
Though there are exceptions, when “- ing modifier” is used with a COMMA, it GENERALLY modifies the subject of the sentence.
I saw Jane, walking down the street.
(I was walking, not Jane)
If a comma is not used between the noun and “- ing modifier,” it modifies the word next to it.
I saw Jane walking down the street.
(Jane was walking, not I)